use std::{io, io::Write};
use thiserror::Error;

mod parser;

use parser::Command;

fn prompt() -> Result<(), ShackleError> {
    print!("> ");
    io::stdout().flush()?;
    Ok(())
}

fn read_stdin() -> Result<String, ShackleError> {
    let mut buffer = String::new();
    io::stdin().read_line(&mut buffer)?;
    Ok(buffer)
}

fn main() -> Result<(), ShackleError> {
    loop {
        prompt()?;
        let user_input = read_stdin()?;

        match user_input.parse::<Command>() {
            Err(unknown_input) => {
                println!("Unknown input \"{}\"", unknown_input);
            }
            Ok(Command::Whitespace) => {}
            Ok(Command::Exit) => {
                break;
            }
            Ok(Command::GitInit(repo_name)) => {
                println!("Successfully created {}.git", repo_name);
            }
        }
    }
    Ok(())
}

#[derive(Error, Debug)]
enum ShackleError {
    #[error(transparent)]
    IoError(#[from] io::Error),
}